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If the 2nd and 3rd terms in the expansi...

If the 2nd and 3rd terms in the expansion of `(1+x)^n` are `20a and 180a^2` respectively then `(x,n)=`

A

`(2a,10)`

B

`(3a,8)`

C

`(3a,12)`

D

`(4a,7)`

Text Solution

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-BINOMIAL THEOREM-EXERCISE 1A (BINOMIAL THEOREM WITH INTEGRAL INDEX)
  1. If the 3rd, 4th and 5th terms of (x+a)^n are 720, 1080 and 810 respect...

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  2. If the 3rd, 4th and 5th terms of (x+a)^n are 60, 160, 240 respectivel...

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  3. If the 2nd and 3rd terms in the expansion of (1+x)^n are 20a and 180a...

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  4. If the coefficients of x^3 and x^4 in the expansion of (1+ax+bx^3)(1-2...

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  5. 5th term of (2x^2+(3)/(x))^5 is 10. Then x=

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  6. If the third time in the expansion of ((1)/(x)+x log10 x) 1 then x=

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  7. If the fourth term in the expansion of (sqrt(x^(1//(logx+1)))+x^(1//12...

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  8. If the 6th term in the expansion of ((1)/(x^(8//3))+x^2 log10 x)^8 is ...

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  9. If the third term in the expansion of ((1)/(x)+x^(log10 x) x)^5 is 100...

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  10. If the third term in the expansion of (x + x log10 x)^5 is 10^6 then x...

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  11. If the ratio of the 7th term from the beginning to the 7th term from t...

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  12. If two consecutive terms in the expansion of (x+a)^n are equal to wher...

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  13. If the coefficient of pth term in the expansion of (1+x)^n is p and th...

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  14. If p and q are the coefficients of x^n in (1+x)^(2n-1) and (1+x)^(2n)...

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  15. If the 5th term is 4 times the 4th term and the 4th term is 6 times th...

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  16. If a1,a2, a3,a4 are the coefficients of 2nd, 3rd, 4th and 5th terms of...

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  17. If P and Q are the sum of odd terms and the sum of even terms respecti...

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  18. If the sum of odd terms and the sum of even terms in the expansion of ...

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  19. If P and Q are the sum of odd terms and the sum of even terms respecti...

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  20. The coefficient of x^p in the expansion of (x^2+(1)/(x))^(2n) is

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